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May 28th, 2016
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  1. list={a,b,a,b,a,b,a,a,b}
  2.  
  3. Cases[list, Repeated[a,{2}]]
  4.  
  5. list={a,b,a,b,b,b,a,b,a,a,b};
  6. SequenceCases[list,{Repeated[x_,{2}]}]
  7.  
  8. containsRepeatedQ = SequenceCases[#,{Repeated[x_,{#2}]}] != {}&;
  9.  
  10. containsRepeatedQ[{a,b,a,b,a,b,a,b}, 2]
  11.  
  12. containsRepeatedQ[{a,b,a,b,a,b,a,a,b}, 2]
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